Citation: Chu Senlin, Li Xin, Robertson Alex W., Sun Zhenyu. Electrocatalytic CO₂ Reduction to Ethylene over CeO₂-Supported Cu Nanoparticles: Effect of Exposed Facets of CeO₂[J]. Acta Physico-Chimica Sinica, ;2021, 37(5): 200902. doi: 10.3866/PKU.WHXB202009023 shu

Electrocatalytic CO₂ Reduction to Ethylene over CeO₂-Supported Cu Nanoparticles: Effect of Exposed Facets of CeO₂

1.
State Key Laboratory of Organic-Inorganic Composites, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2.
Department of Materials, University of Oxford, Oxford, OX1 3PH, UK

Corresponding author: Sun Zhenyu, sunzy@mail.buct.edu.cn
Received Date: 7 September 2020
Revised Date: 28 September 2020
Accepted Date: 28 September 2020
Available Online: 15 October 2020
Fund Project: National Natural Science Foundation of China 21972010This work was supported by National Natural Science Foundation of China (21972010) and Beijing Natural Science Foundation, China (2192039)Beijing Natural Science Foundation, China 2192039

Fossil fuels are expected to be the major source of energy for the next few decades. However, combustion of nonrenewable resources leads to the release of large quantities of CO₂, the primary greenhouse gas. Notably, the concentration of CO₂ in the atmosphere is increasing annually at an astounding rate. Electrochemical CO₂ reduction (ECR) to value-added fuels and chemicals using electricity from intermittent renewable energy sources is a carbon-neutral method to alleviate anthropogenic CO₂ emissions. Despite the steady progress in the selective generation of C₁ products (CO and formic acid), the production of multi-carbon species still suffers from low selectivity and efficiency. As an ECR product, ethylene (C₂H₄) has a higher energy density than do C₁ species and is an important industrial feedstock in high demand. However, the conversion of CO₂ to C₂H₄ is plagued by low productivity and large overpotential, in addition to the severe competing hydrogen evolution reaction (HER) during the ECR. To address these issues, the design and development of advanced electrocatalysts are critical. Here, we demonstrate fine-tuning of ECR to C₂H₄ by taking advantage of the prominent interaction of Cu with shape-controlled CeO₂ nanocrystals, that is, cubes, rods, and octahedra predominantly covered with (100), (110), and (111) surfaces, respectively. We found that the selectivity and activity of the ECR depended strongly on the exposed crystal facets of CeO₂. The overall ECR Faradaic efficiency (FE) over Cu/CeO₂(110) (FE ≈ 56.7%) surpassed that of both Cu/CeO₂(100) (FE ≈ 51.5%) and Cu/CeO₂(111) (FE ≈ 48.4%) in 0.1 mol·L^-1 KHCO₃ solutions with an H-type cell. This was in stark contrast to the exclusive occurrence of the HER over pure carbon paper, CeO₂(100), CeO₂(110), and CeO₂(111). In particular, the FE toward C₂H₄ formation and the partial current density increased in the sequence Cu/CeO₂(111) < Cu/CeO₂(100) < Cu/CeO₂(110) within applied bias potentials from -1.00 to -1.15 V (vs. the reversible hydrogen electrode), reaching 39.1% over Cu/CeO₂(110) at a mild overpotential (1.13 V). The corresponding values for Cu/CeO₂(100) and Cu/CeO₂(111) were FE_C₂_H₄ ≈ 31.8% and FE_C₂_H₄ ≈ 29.6%, respectively. The C₂H₄ selectivity was comparable to that of many reported Cu-based electrocatalysts at similar overpotentials. Furthermore, the FE for C₂H₄ remained stable even after 6 h of continuous electrolysis. The superior ECR activity of Cu/CeO₂(110) to yield C₂H₄ was attributed to the metastable (110) surface, which not only promoted the effective adsorption of CO₂ but also remarkably stabilized Cu⁺, thereby boosting the ECR to produce C₂H₄. This work offers an alternative strategy to enhance the ECR efficiency by crystal facet engineering.
- CO₂,
- Electrochemical reduction,
- Ethylene,
- Cu,
- CeO₂,
- Exposed facet
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Electrocatalytic CO2 Reduction to Ethylene over CeO2-Supported Cu Nanoparticles: Effect of Exposed Facets of CeO2

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通讯作者: 陈斌, bchen63@163.com

Electrocatalytic CO₂ Reduction to Ethylene over CeO₂-Supported Cu Nanoparticles: Effect of Exposed Facets of CeO₂